| EPSRC Reference: |
GR/L22454/01 |
| Title: |
THEORY OF JOSEPHSON JUNCTIONS IN ANISTROPIC SUPERCONDUCTORS |
| Principal Investigator: |
Annett, Professor JF |
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| Department: |
Physics |
| Organisation: |
University of Bristol |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 January 1997 |
Ends: |
31 December 1999 |
Value (£): |
107,964
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| EPSRC Industrial Sector Classifications: |
| Aerospace, Defence and Marine |
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Summary on Grant Application Form |
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Much recent work shows that the high temperature superconductors have either a d-wave or a highly anisotropic s-wave energy gap. In either case there will be important implications for the Josephson effect, which have not been explored theoretically. Current experimental tests of the pairing state symmetry using Josephson effects rely on simplistic assumptions about the coupling in junctions of varying orientations. By solving the Bogoliubov de Gennes equations numerically in the junction region we will provide an accurate theoretical model for the tunnel current. Our calculations will be the first to determine the critical current in grain boundary junctions as a function of grain misorientation. The results will have implications both for tests of the pairing state symmetry, and for the properties of thin films and granular bulk superconductors, which are networks of these weak links. Using our single junction results we will build accurate models of these random networks and simulate their behaviour numerically. This will clarify the role of grain misalignment in determining bulk critical currents and microwave impedance. For d-wave gaps we will determine the effects of frustration due to -junctions in the networks.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.bris.ac.uk |